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JUNEAU, Alaska — Three companies emerged Thursday with a proposal to build a 745-mile natural gas pipeline from Alaska’s North Slope to the border with Canada’s Yukon Territory.

Company officials estimate the pipeline would cost $6.3 billion. It would connect with a proposed companion pipeline at the Alaska-Yukon border to bring the gas to systems in Canada and the United States.

More than 35 trillion cubic feet of natural gas has been stranded at its North Slope source for decades.

MidAmerican Energy Holdings Co., of Des Moines Iowa, and its subsidiary, MEHC Alaska Gas Transmission Co., along with a consortium of Alaska Native corporations, filed applications to build the pipeline with the Alaska Department of Revenue.